Lining tube for restoring defective sewer shafts including a berm and a channel, and method for producing same, and method for lining a defective sewer shaft

A lining tube for restoring a defective sewer shaft, wherein the sewer shaft has a first shaft portion with a first diameter and an adjacent second shaft portion with an expanded diameter and a berm and a channel, the lining tube comprising:

• an inner film tube;
• a tubular layer of fiber material arranged around said inner film tube and configured to be radially expanded, said fiber material being impregnated with a curable reaction resin;
• said inner film tube having a connection portion which extends in a longitudinal direction thereof, and which connects two circumferential portions, of said inner film tube that extend parallel with each other, to form a circumferentially closed inner film tube having a defined nominal diameter;
• said connection portion having a desired breaking location which extends along the inner film tube and which is configured to be separated by introducing a pressurized medium into said inner film tube in a circumferential direction in order to radially expand said inner film tube and said layer of fiber material over the nominal diameter;
• said radially expandable tubular layer of fiber material being closed at a first end which can be introduced into the channel of the sewer shaft by a seam that extends orthogonally with respect to the longitudinal axis of the tubular layer of fiber material.

A method for producing a lining tube, the method comprising:

• shaping a transparent plastics material flat film to form a circumferentially closed inner film tube having a predetermined nominal diameter by overlapping adhesive bonding or welding of longitudinal edges of the transparent plastics material flat film and/or by adhesive bonding or thermally welding a transparent film strip on two adjacent, mutually parallel outer circumferential portions of the plastics material flat film which is arranged in a tubular manner with a connection portion that has a desired breaking location which extends in a longitudinal direction of the inner film tube being produced;
• arranging a radially expandable tubular layer of fiber material on an outer side of the circumferentially closed tubular inner film tube by overlapping helical winding or overlapping placement of at least one resin-impregnated fiber tape around the inner film tube;
• and
• closing a first lower end of the layer of fiber material by a seam, which extends orthogonally to the longitudinal axis of the tubular, radially expandable layer of fiber material.

A method for lining a defective sewer shaft, which has a first shaft portion with a first diameter and an adjacent second shaft portion with an expanded diameter, and a berm and a channel below the second shaft portion, the method comprising:

• providing a lining tube according to claim and securing one end of the lining tube to a pot-shaped packer;
• lifting the packer with the lining tube secured thereto into a vertical position above the sewer shaft such that the seam is located at the lower end of the lining tube, orientating the seam along the channel of the sewer shaft, orientating the end of the lining tube that is closed by the seam until the seam extends parallel to the longitudinal direction of the channel and lowering the packer with the lining tube secured thereto into the sewer shaft until the seam comes to rest in the channel;
• expanding an air bag which is closed in an air-tight manner in the region of the base of the sewer shaft inside the lining tube by introducing a pressurized medium into the air bag to radially expand the lining tube inside the sewer shaft with the desired breaking location being separated in the connection portion and the lining tube bearing on the inner wall of the expanded second sewer portion and on the berm and the channel;
• and
• curing the reaction resin in the layer of fiber material by introducing a radiation source or hot vapor or hot water into the interior of the expanded air bag arranged in the lining tube.